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L4V Hook Deadlocks L4V hook-deadlocks are an excellent upgrade for side and back van doors, as well as tailgates or doors to the cab. They operate independently of the locking system and are secured by a a high-security key. Designed specifically to combat 'peel and steal' attacks this product has been independently tested increasing resistance by up to 300%. It is ideal for couriers with multiple drops or in situations where the driver is prone to overlook locking the door of their vehicle. Hook Deadlock A hook deadlock